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The effect of Sodium Diclofenac (SD) as an inhibitor of pure iron corrosion in a 1.0 N of sulfuric acid was studied spectrally using a UV-VIS at different temperatures of 343.15, 323.15, 303.15 K. The concentration of dissolved iron was determined spectrally using phenanthroline method. The absorbance of each solution was measured at different times, and the data obtained were used to calculate the corrosion rate, which was found to be a zero-order reaction in the presence and absence of the SD inhibitor. The absorbance was decreased with an increase in inhibitor concentration and an increase in temperature. However, the inhibition efficiency was increased with inhibitor concentration an increase. The inhibitor is adsorbed on the surface of the iron particles according to the Langmuir and Kinetic-thermodynamic model of adsorption isotherm. The results indicated that the reaction is endothermic and unspontaneous. Quantum chemical parameters such as the highest & lowest occupied molecular orbital energy (EHOMO) & (ELUMO), energy gap (ΔE), were calculated and correlated to the experimental data.